#include "pch.h"
#include "..\include\winrtsock.h"
#include "..\include\winrtsockEx.h"
#include "Include\InternalSocketManagement.h"

using namespace std;

//FROM FREEBSD - WITH MODIFICAIONS

/*	$KAME: inet_pton.c,v 1.5 2001/08/20 02:32:40 itojun Exp $	*/

/* Copyright (c) 1996 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/

#include <string.h>
#include <errno.h>

/*
* WARNING: Don't even consider trying to compile this on a system where
* sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
*/

static int	inet_pton4(const char *src, uint8_t *dst);
static int	inet_pton6(const char *src, uint8_t *dst);

/*
*
* The definitions we might miss.
*
*/
#ifndef NS_INT16SZ
#define	NS_INT16SZ	2
#endif

#ifndef NS_IN6ADDRSZ
#define NS_IN6ADDRSZ 16
#endif

#ifndef NS_INADDRSZ
#define NS_INADDRSZ 4
#endif

/* int
* inet_pton(af, src, dst)
*	convert from presentation format (which usually means ASCII printable)
*	to network format (which is usually some kind of binary format).
* return:
*	1 if the address was valid for the specified address family
*	0 if the address wasn't valid (`dst' is untouched in this case)
*	-1 if some other error occurred (`dst' is untouched in this case, too)
* author:
*	Paul Vixie, 1996.
*/
int __stdcall inet_pton(int af, const char *src, void *dst)
{
    switch (af) {
    case AF_INET:
        return (inet_pton4(src, (uint8_t*)dst));
    case AF_INET6:
        return (inet_pton6(src, (uint8_t*)dst));
    default:
#ifdef EAFNOSUPPORT
        errno = EAFNOSUPPORT;
#else
        errno = ENOSYS;
#endif
        return (-1);
    }
    /* NOTREACHED */
}

/* int
* inet_pton4(src, dst)
*	like inet_aton() but without all the hexadecimal and shorthand.
* return:
*	1 if `src' is a valid dotted quad, else 0.
* notice:
*	does not touch `dst' unless it's returning 1.
* author:
*	Paul Vixie, 1996.
*/
static int inet_pton4(const char *src, uint8_t *dst)
{
    static const char digits [] = "0123456789";
    int saw_digit, octets, ch;
    uint8_t tmp[NS_INADDRSZ], *tp;

    saw_digit = 0;
    octets = 0;
    *(tp = tmp) = 0;
    while ((ch = *src++) != '\0') {
        const char *pch;

        if ((pch = strchr(digits, ch)) != NULL) {
            uint32_t n = *tp * 10 + (pch - digits);

            if (n > 255)
                return (0);
            *tp = (uint8_t)n;
            if (!saw_digit) {
                if (++octets > 4)
                    return (0);
                saw_digit = 1;
            }
        }
        else if (ch == '.' && saw_digit) {
            if (octets == 4)
                return (0);
            *++tp = 0;
            saw_digit = 0;
        }
        else
            return (0);
    }
    if (octets < 4)
        return (0);

    memcpy(dst, tmp, NS_INADDRSZ);
    return (1);
}

/* int
* inet_pton6(src, dst)
*	convert presentation level address to network order binary form.
* return:
*	1 if `src' is a valid [RFC1884 2.2] address, else 0.
* notice:
*	(1) does not touch `dst' unless it's returning 1.
*	(2) :: in a full address is silently ignored.
* credit:
*	inspired by Mark Andrews.
* author:
*	Paul Vixie, 1996.
*/
static int inet_pton6(const char *src, uint8_t *dst)
{
    static const char xdigits_l [] = "0123456789abcdef",
        xdigits_u [] = "0123456789ABCDEF";
    uint8_t tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
    const char *xdigits, *curtok;
    int ch, saw_xdigit;
    uint32_t val;

    memset((tp = tmp), '\0', NS_IN6ADDRSZ);
    endp = tp + NS_IN6ADDRSZ;
    colonp = NULL;
    /* Leading :: requires some special handling. */
    if (*src == ':')
        if (*++src != ':')
            return (0);
    curtok = src;
    saw_xdigit = 0;
    val = 0;
    while ((ch = *src++) != '\0') {
        const char *pch;

        if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
            pch = strchr((xdigits = xdigits_u), ch);
        if (pch != NULL) {
            val <<= 4;
            val |= (pch - xdigits);
            if (val > 0xffff)
                return (0);
            saw_xdigit = 1;
            continue;
        }
        if (ch == ':') {
            curtok = src;
            if (!saw_xdigit) {
                if (colonp)
                    return (0);
                colonp = tp;
                continue;
            }
            if (tp + NS_INT16SZ > endp)
                return (0);
            *tp++ = (uint8_t) (val >> 8) & 0xff;
            *tp++ = (uint8_t) val & 0xff;
            saw_xdigit = 0;
            val = 0;
            continue;
        }
        if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
            inet_pton4(curtok, tp) > 0) {
                tp += NS_INADDRSZ;
                saw_xdigit = 0;
                break;	/* '\0' was seen by inet_pton4(). */
        }
        return (0);
    }
    if (saw_xdigit) {
        if (tp + NS_INT16SZ > endp)
            return (0);
        *tp++ = (uint8_t) (val >> 8) & 0xff;
        *tp++ = (uint8_t) val & 0xff;
    }
    if (colonp != NULL) {
        /*
        * Since some memmove()'s erroneously fail to handle
        * overlapping regions, we'll do the shift by hand.
        */
        const int n = tp - colonp;
        int i;

        for (i = 1; i <= n; i++) {
            endp[-i] = colonp[n - i];
            colonp[n - i] = 0;
        }
        tp = endp;
    }
    if (tp != endp)
        return (0);
    memcpy(dst, tmp, NS_IN6ADDRSZ);
    return (1);
}
